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Date: Wed, 15 Dec 2010 17:16:21 +0200
From: Andriy Gapon <avg@freebsd.org>
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To: Olivier Smedts <olivier@gid0.org>,
	"Vladislav V. Prodan" <universite@ukr.net>
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Cc: freebsd-current@freebsd.org, freebsd-geom@freebsd.org
Subject: Re: Low speed disk subsystem after the upgrade 8.1-STABLE-201011
 --> 9-CURRENT
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on 15/12/2010 16:25 Olivier Smedts said the following:
> 2010/12/15 Vladislav V. Prodan <universite@ukr.net>:
>> 15.12.2010 15:11, Vladislav V. Prodan wrote:
>>
>>> Now try to attach a screenshot.
>>>
>>>
>>
>> http://img576.imageshack.us/i/dsc00563u.jpg/
> 
> ad6: TIMEOUT - READ_DMA retrying (1 retry left) LBA=8638372
> 
> Maybe installkernel/installworld copied files on bad clusters, they
> were previously bad but you notice only now that there are system
> files on them...

This indeed looks like a problem caused by disk.
There shouldn't have been the panic though ("bio_completed can't be greater than
bio_length").
It's a possible geom or ad driver problem.
What is your geom topology on this system?

Changing cc: from fs@ to geom@.

-- 
Andriy Gapon